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n
1
sin
1
= n
2
sin
2
,
d = m/v,
sin = opp/hyp,
cos = adj/hyp,
tan = opp/adj
a
2
+b
2
=c
2
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d = m/v,
sin = opp/hyp,
cos = adj/hyp,
tan = opp/adj
a2+b2=c2